We have a sick 18 month old rhode island red rooster.

[Greenhron]

With in a day and a half he went from a chicken with a attitude to being able to walk right up and pick him up. He just sits around doesn't walk much. Clear stool with a little white in it. Loose feathers. Can anyone help?

 

[dlhunicorn]

Will need more info in order to be able to help you...
Housing, bedding and weather conditions and what he eats and where ... > is the feed left on the ground for instance, has it been rainy in the last week... are there any stagnant sources of water available ( a puddle for instance from a recent rainstorm) etc.